Accupro T2690443 Spiral Point Tap 5/16-18 3 Flute Hss

Product Description

The ACCUPRO T2690443 is a spiral point tap designed to cut 5/16-18 UNC internal threads in through-hole applications. It features a plug chamfer, 3-flute geometry, and a right-hand thread direction. The tap is manufactured from 3% Vanadium High Speed Steel with a bright finish, offering solid wear resistance in a range of materials. At 2.72 inches overall length with a 22 mm thread length, it is sized for standard hand-tap holders and machine tap adapters. This tap is suited for machinists, tool-and-die technicians, and maintenance mechanics working in production or job-shop environments.

The T2690443 is rated for use in titanium and other demanding materials where vanadium HSS provides an advantage over standard M2 HSS. The plug chamfer style makes it appropriate for through-hole tapping where the tap can pass fully through the workpiece. The H3 thread limit and 3B class of fit ensure the finished thread meets standard tolerance requirements for most fastener applications. It is compatible with both CNC tapping cycles and manual tap handles depending on the setup.

Key Features

• 5/16-18 UNC thread size with H3 thread limit for consistent tolerance control
• 3-flute spiral point geometry pushes chips forward, reducing clogging in through-hole operations
• Plug chamfer allows progressive thread engagement over several leading threads
• 3% Vanadium High Speed Steel construction rated for use in titanium
• Bright finish with no coating — suitable for use with cutting oil or tapping fluid
• Right-hand thread direction, non-coolant-through design

Compatibility

Designed for through-hole tapping of 5/16-18 UNC threads. Fits standard tap holders sized for an 8.08 mm shank diameter. Suitable for use in materials including titanium as noted by the manufacturer.

Installation Notes

This tap should be installed in a properly sized tap holder or chuck rated for the shank diameter before use. Always ensure the workpiece is securely fixtured and that a suitable cutting lubricant or tapping fluid is applied before starting the threading operation. Do not reverse the tap under power without confirming the machine cycle supports it. Inspect the tap for wear or chipping before each use, as a damaged tap can produce out-of-tolerance threads or break in the hole.